William de PERCY & Ellen de BALIOL 
They had a son named Henry I de.
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Personal Details
William de PERCY
William de was born about 1198 in Alnwick, Northumberland, England. He died about July 28th, 1215 in Yorkshire, England.
Ellen de BALIOL
Ellen de was born about 1200 in ALnwick, Northumberland, England. She died before November 22nd, 1281.
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Children
Henry I de PERCY
Henry I de was born in 1235 in Petworth, Sussex, England. He died at the age of 37 on August 29th, 1272 in Sallay, West Riding, Yorkshire, England.